Probability of Survival following Exposure to whole-Body kadiation: The probability of survival can be related to symptomatology in maa. The following analysis is based on the ubservations made on the Japanese i I K & divided according to signs and symptoms, into groups having ditferent prognosis. Thus, they may be divided into three groups in which survival is, respectively, improbable, possible and probable, otiginally made by Cronkite (7). line hh of demarcation among This grouping was-a It is apparent that there is no sharp no: the groups. Survival Improbable: hours and continues ana er is EXC If vomiting occurs promptly or within a few of followed by diarrhea, anorexia, and fever, in rapid succession by prostration the prognosis is grave. Death will pro dyn. wit expec thir Sutvival Possible: Vomiting may occur, but will he of telative! short duration tollowed by a period of well-being. in ¢ In this period‘ol Plat well~being, marked changes are taking place in the henopoietic tiss' tine Hiro, months. The neutrophil count falls to low levels, time of maximum depression depending upon et al. (20). the degree aud tite the dose as illustrated levels after two weeks. this category, the laten steel Bey? -96-— a a NEAT TUR Sn AD ET a ie ag ene emery Odnee EET aeROECE eee Sompl 75,00: defen: tes a are CS: LD ace Evidence of bleeding tay occur within 2-4-8 In the higher exposure groups of at ere k ary ao this Platelet count nay reach, very ae This group represents a lethal duse range in the classical pharmaco sense. : Signs of bacterial infection may develop when the tags neutrophil count falls below 500/u1l,. Mars} Fen. = 3